mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-26 10:49:33 +00:00
81 lines
2.8 KiB
EmacsLisp
81 lines
2.8 KiB
EmacsLisp
;;; format-spec.el --- functions for formatting arbitrary formatting strings
|
|
|
|
;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
|
|
;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
|
|
|
|
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
|
|
;; Keywords: tools
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software: you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation, either version 3 of the License, or
|
|
;; (at your option) any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;;; Code:
|
|
|
|
(eval-when-compile (require 'cl))
|
|
|
|
(defun format-spec (format specification)
|
|
"Return a string based on FORMAT and SPECIFICATION.
|
|
FORMAT is a string containing `format'-like specs like \"bash %u %k\",
|
|
while SPECIFICATION is an alist mapping from format spec characters
|
|
to values. Any text properties on a %-spec itself are propagated to
|
|
the text that it generates."
|
|
(with-temp-buffer
|
|
(insert format)
|
|
(goto-char (point-min))
|
|
(while (search-forward "%" nil t)
|
|
(cond
|
|
;; Quoted percent sign.
|
|
((eq (char-after) ?%)
|
|
(delete-char 1))
|
|
;; Valid format spec.
|
|
((looking-at "\\([-0-9.]*\\)\\([a-zA-Z]\\)")
|
|
(let* ((num (match-string 1))
|
|
(spec (string-to-char (match-string 2)))
|
|
(val (cdr (assq spec specification))))
|
|
(unless val
|
|
(error "Invalid format character: `%%%c'" spec))
|
|
;; Pad result to desired length.
|
|
(let ((text (format (concat "%" num "s") val)))
|
|
;; Insert first, to preserve text properties.
|
|
(insert-and-inherit text)
|
|
;; Delete the specifier body.
|
|
(delete-region (+ (match-beginning 0) (length text))
|
|
(+ (match-end 0) (length text)))
|
|
;; Delete the percent sign.
|
|
(delete-region (1- (match-beginning 0)) (match-beginning 0)))))
|
|
;; Signal an error on bogus format strings.
|
|
(t
|
|
(error "Invalid format string"))))
|
|
(buffer-string)))
|
|
|
|
(defun format-spec-make (&rest pairs)
|
|
"Return an alist suitable for use in `format-spec' based on PAIRS.
|
|
PAIRS is a list where every other element is a character and a value,
|
|
starting with a character."
|
|
(let (alist)
|
|
(while pairs
|
|
(unless (cdr pairs)
|
|
(error "Invalid list of pairs"))
|
|
(push (cons (car pairs) (cadr pairs)) alist)
|
|
(setq pairs (cddr pairs)))
|
|
(nreverse alist)))
|
|
|
|
(provide 'format-spec)
|
|
|
|
;; arch-tag: c22d49cf-d167-445d-b7f1-2504d4173f53
|
|
;;; format-spec.el ends here
|